Improving Predictions of Mid-frequency Sound Propagation and Reverberation in a Deep Ice-Covered Ocean
Abstract
This one-year trial effort is aimed to investigate combined effects of critical variables of arctic environments, the roughness, elasticity, and layered structure of sea ice, as well stratification of water column (Arctic surface and sub-surface ducts). A hybrid full-wave approach is proposed that combines PE, Image Source, and Ray models, that allows analysis of sound intensity time series measured under ice at short and medium ranges. The approach is tested on two mid-frequency acoustic datasets. The first one is comprised of ICEX14 data obtained using 3500Hz 5s-long CW pulses for fixed geometry of source and receiver at ~30m depths and ~720m range. The second one, considered for a trial analysis, is a much more comprehensive dataset collected during ICEX16 using mobile transmitters, various source-receiver ranges (0.3-10km), depths (45-183m), and transmitted waveforms (CW pulses and LFM sweeps). For both datasets, the spatial and temporal structures of multi-path propagation arrivals and reverberation caused by reflections and scattering from rough ice and bottom are analyzed, and results of model-data comparisons are presented.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 25, 2022
- Accession Number
- AD1178422
Entities
People
- Anatoliy Ivakin
Organizations
- University of Washington